Judge Cahill added: “He thought it was something that he enjoyed, something that he wanted.

“You were the adult in this situation, you should have kept him at arms length.

“But you encouraged him.

“You told him you loved him, you told him you wanted this with him.

“That is not the sort of conduct one expects from a woman of your age.”

Horsfall was also told she must go on the sex offenders register for life

Jeremy Lindsay, mitigating, said Horsfall had no previous convictions and was of previous good character.

He said Horsfall was due to give birth in a few months.

DC Elkie Gardner of the Wakefield Child Safeguarding Unit, said: “This has been a complex and long running investigation and we welcome Horsfall’s sentencing this afternoon.

“She knew her vulnerable victim was under the age of sexual consent and yet both created and encouraged the circumstances for the offending to take place. Despite a large volume of evidence against her, she still put her victim through the ordeal of a full trial.

“Wakefield police will not tolerate child abuse of any kind and will take positive action against perpetrators.”

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